BT-2166C 32 in 1 Multi-specification Screwdriver Set Torx Phillip Y-Type U-type Circle 0.9 For Laptop Power Strip Cell Phone Repair Professinal design, beauty appearance and portable screwdriver set is easy to useMultipoint and adjustable extension bar is easy to disassemble and can be changed the length according to different requirementsHigh quality and precision screw heads of all types are suitable for work in different areasThe handle of ergonomic design is easy to operate. Precision screw heads under high temperature processing are made of high quality chrome- vanadium steel (6150#), whose HRC is from 52-56 degree.